7.1.3. Check of serviceability of grounding

This check is made for the purpose of definition of reliability of grounding of elements of a chain. Switch-off the rechargeable battery and connect one of wires of the lamp sampler having the independent power supply to obviously well grounded point. Connect other wire of a lamp to the checked plait of conducting or the plug of the electric socket. If the lamp lights up, grounding as it should be (and vice versa).